Each of the following items must be replaced when traveling to forty thousand km
(1)solenoid valve,valve core gasket, stem seal ring.
(2)Primary pressure reducer filter core
(3)Filter core of high pressure filter
(4)Pneumatic valve spool
To ensure the normal operation of the vehicle, the driver should be regularly on the vehicle gas system leak, may require repair site staff to assist the accurate testing of the gas leak detection system using the detector in the conditions allow, routine testing driver also with the aid of liquid soap, check valve, hose connectors, to ensure that no white frost. If found the leak should be immediately repaired.